Pitch positioning device of stamping die

Abstract

The pitch positioning device comprises an upper die base, a lower die base and a pitch stop lever, a stamping head is arranged at the bottom end of the upper die base, a stamping groove matched with the stamping head is formed in the top end of the lower die base, and the pitch stop lever is arranged on the lower die base; when stamping work is carried out, the upper die base is matched with the lower die base, then a convex hull integrally formed with a material belt is stamped in a waste area of the material belt under the action of the stamping head and the stamping groove, the convex hull is of a rectangular structure, and the side face of the convex hull abuts against the side face of the pitch stop lever in a matched mode so that pitch positioning of the material belt can be achieved. The stamping device has the beneficial effects that the integrally-formed convex hulls are formed on the material belt in a stamping mode, pitch positioning conveying of the material belt can be achieved, the conveying distance of each time is the distance of one pitch, and then the stamping precision is guaranteed; in addition, the convex hulls are located in the waste material area of the material belt, and therefore landing edges do not need to be reserved on the two sides of the material belt, material waste of the material belt is reduced, and production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of stamping technology, and in particular to a pitch positioning device for a stamping die. Background Technology

[0002] For continuous stamping dies, automatic feeding and consistent feed length are required, necessitating pitch positioning: positioning is achieved by controlling the feeding distance to ensure stamping accuracy. Existing pitch positioning methods primarily involve leaving a certain width of overlap on both sides of the strip and using pitch stops for precise control of each feed. However, this method results in a large overlap at the strip edges, leading to material waste and higher costs. Therefore, a pitch positioning device for stamping dies is proposed to address these technical problems. Utility Model Content

[0003] One of the objectives of this application is to provide a pitch positioning device for a stamping die.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a pitch positioning device for a stamping die, comprising an upper die base, a lower die base, and a pitch stop bar. A stamping head is provided at the bottom of the upper die base, and a stamping groove cooperating with the stamping head is provided at the top of the lower die base. The pitch stop bar is disposed on the lower die base. During stamping operations, the upper die base and the lower die base cooperate, thereby causing the scrap area of ​​the strip to be stamped into a convex shape integrally formed with the strip under the action of the stamping head and the stamping groove. The convex shape has a rectangular structure, and the side of the convex shape abuts against the side of the pitch stop bar to achieve pitch positioning of the strip.

[0005] Preferably, the adjacent sides of the convex hull are provided with a chamfer structure.

[0006] Preferably, the thickness of the strip is H, the thickness of the convex bulge is h, and 0.5H≦h≦0.7H.

[0007] Preferably, the lower die holder is provided with an elastic component; when the upper die holder separates from the lower die holder, the protrusion is adapted to move upward under the action of elastic force and separate from the stamping groove.

[0008] Preferably, the elastic component includes a top block one and a top block two. Both the top block one and the top block two are vertically slidably installed in the lower die base and connected to the lower die base through a nitrogen spring. The top block one is located in the stamping groove and cooperates with the protrusion, while the top block two cooperates with the strip.

[0009] Preferably, a flattening block is provided inside the lower mold base; when the upper mold base and the lower mold base are closed again, the protrusion is adapted to be compressed to be flush with the material strip under the action of the flattening block.

[0010] Preferably, the upper die holder is provided with a tapping device, and the lower die holder is provided with a positioning rod; during the stamping operation, the tapping device is adapted to tap the product area of ​​the strip to generate a threaded hole, and the positioning rod is adapted to cooperate with the threaded hole to limit the strip.

[0011] Preferably, the top end of the positioning rod has a tapered structure, thereby allowing the top end of the positioning rod to have a clearance fit with the threaded hole.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] This invention achieves pitch-positioned conveying of the material strip by stamping an integrally formed convex bump onto the strip, ensuring that each conveying distance is one pitch, thus guaranteeing the accuracy of the stamping. In addition, the convex bump is located in the waste area of ​​the strip, so there is no need to reserve overlap on both sides of the strip, thereby reducing material waste and lowering production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the upper mold base after separation according to this utility model.

[0016] Figure 3 This is a schematic diagram showing the material strip of this utility model located inside the lower mold base.

[0017] Figure 4 This is a schematic diagram of the specific structure of the material strip of this utility model.

[0018] Figure 5 This is a schematic diagram illustrating the stamping process of the material strip according to this utility model.

[0019] Figure 6 This is a schematic diagram of the convex bulge structure in the waste area of ​​this utility model.

[0020] Figure 7 This is a schematic diagram of the elastic component structure of this utility model.

[0021] Figure 8 This is a schematic diagram of the specific structure of the convex hull of this utility model.

[0022] Figure 9 This is a schematic diagram showing the thickness of the convex bulge and the material strip of this utility model.

[0023] In the diagram: 1. Upper mold base; 2. Lower mold base; 3. Material strip; 301. Product area; 302. Scrap area; 4. Convex bulge; 5. Pitch stop bar; 6. Elastic component; 601. Ejector block one; 602. Ejector block two; 603. Nitrogen spring; 7. Threaded hole; 8. Positioning rod. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] One preferred embodiment of this application, such as Figures 1 to 9 As shown, a pitch positioning device for a stamping die includes an upper die base 1, a lower die base 2, and a pitch stop bar 5. A stamping head (not shown) is provided at the bottom of the upper die base 1, and a stamping groove (not shown) that cooperates with the stamping head is provided at the top of the lower die base 2. The pitch stop bar 5 is provided inside the lower die base 2.

[0028] It is understandable that during stamping operations, such as Figure 1 As shown, the upper die holder 1 and the lower die holder 2 close to perform stamping work on the strip 3. The strip 3 has a product area 301 and a scrap area 302. At this time, the scrap area 302 of the strip 3 is stamped out with a protrusion 4 under the cooperation of the stamping head and the stamping groove. This protrusion 4 and the strip 3 are integrally formed, and the protrusion 4 is the key to realizing the subsequent pitch positioning of the strip 3.

[0029] Specifically, after the first stamping operation, the upper die holder 1 moves upward and separates from the lower die holder 2. At this time, the feeding module of the stamping die will transport the strip 3 forward for the next stamping operation. The protrusion 4 will also move forward with the strip 3. When the protrusion 4 and the pitch stop bar on the lower die holder 2 engage, the strip 3 will stop moving. This process is repeated to achieve pitch positioning and conveying of the strip 3, ensuring that each conveying distance is one pitch, thus guaranteeing stamping accuracy. Furthermore, since the protrusion 4 is located in the scrap area 302 of the strip 3, there is no need to reserve overlaps on both sides of the strip 3, thereby reducing material waste and lowering production costs.

[0030] It should be further explained that the convex bulge 4, integrally formed with the strip 3, can be understood as follows: there is no tearing or ripping between the convex bulge 4 and the strip 3. That is, the convex bulge 4 is formed by the local deformation of the material in the scrap area 302 under the action of the stamping head and the stamping groove during the stamping process. The connection strength between the convex bulge 4 and the strip 3 formed in this way is high. Therefore, when the convex bulge 4 abuts against the pitch stop bar 5 later, the convex bulge 4 is not easily deformed or detached under the action of extrusion, thus ensuring the stability and reliability of the pitch positioning.

[0031] It should be understood that in the existing technology, a "tongue-cutting" method is used for pitch positioning. That is, a tongue-cutting punch forms a tongue on the strip 3. As the name suggests, the tongue is tongue-shaped. However, the tongue is only connected to the strip 3 on one side. This method causes a tear between the tongue and the strip 3. This method has the following drawbacks: First, the structure is unstable, and the pitch is not accurate due to the influence of the depth (height) of the tongue. In addition, it is easy to produce slag, which increases the difficulty of cleaning the lower die holder 2. At the same time, the tearing method is also easy to produce filamentous iron filings, which can easily damage the mold during the subsequent mold closing process.

[0032] Based on the above embodiments, we know that the abutting fit between the convex 4 and the pitch stop 5 affects the stability of subsequent positioning. For the stamping head, a circular structure is generally the best because the circular structure of the stamping head is evenly stressed and can prevent the stamping damage of the material strip 3. At this time, the convex 4 will also be circular, so the convex 4 and the pitch stop 5 are in point contact. This results in a small contact area between the two, which in turn affects the stability of positioning.

[0033] Therefore, in order to solve the above-mentioned technical problems, in one embodiment of this application, such as Figure 6 and Figure 8As shown, the surface of the convex hump 4 near the pitch stop 5 is flat (i.e., non-curved), allowing the convex hump 4 and the pitch stop 5 to form a mating surface. This means the contact between the convex hump 4 and the pitch stop 5 is surface-to-surface, significantly increasing the contact area and improving positioning stability and reliability. Furthermore, the flat mating method effectively reduces the force exerted by the convex hump 4 on the pitch stop 5, extending its service life.

[0034] Specifically, such as Figure 8 As shown, the convex hull 4 can adopt a polygonal structure, such as a rectangle (e.g., ...). Figure 8 (as shown in a) and triangles (as shown in the figure) Figure 8 (as shown in c) trapezoidal or semi-circular structures (such as...) Figure 8 (as shown in b) etc., but the surface that mates with the pitch stop 5 must be a planar structure; in this application, the convex hull 4 preferably adopts a rectangular structure. Furthermore, in order to ensure the uniformity of force during subsequent stamping, it is best to provide a chamfered (rounded) corner structure between two adjacent sides of the convex hull 4, so as to avoid stress concentration and prevent the strip 3 from tearing during stamping.

[0035] In a further embodiment, such as Figure 9 As shown, to ensure the connection strength between the convex bulge 4 and the strip 3, and the stability of the convex bulge 4 during subsequent use, the thickness h of the convex bulge 4 needs to be controlled within a certain range. Specifically, let the thickness of the strip 3 be H, and the thickness h of the convex bulge 4 satisfy 0.5H≤h≤0.7H. This thickness design ensures that the convex bulge 4 has sufficient strength and thickness to cooperate with the pitch stop 5, while also preventing damage caused by excessive stamping depth of the strip 3. It also ensures that the convex bulge 4 is not easily broken or detached during stamping, thereby further improving the stability and reliability of pitch positioning. At the same time, the thickness condition design of the convex bulge 4 also prepares for the subsequent flattening and re-pressing of the convex bulge 4, preventing the convex bulge 4 from detaching during flattening.

[0036] It should be noted that this application addresses the use of a relatively thick strip 3. If the strip 3 is thin, it is difficult to form an integrally formed bump 4. Even if the bump 4 can be formed, its strength and thickness may be insufficient to meet the pitch positioning requirements. However, for a thicker strip 3, during the stamping process, the material in the scrap area 302 can be fully deformed under the action of the stamping head and stamping groove to form a bump 4 with sufficient strength and thickness.

[0037] In one embodiment of this application, such as Figure 7As shown, an elastic component 6 can be provided inside the lower die holder 2. It can be understood that after the upper die holder 1 moves upward and separates from the lower die holder 2, the protrusion 4 will be located in the stamping groove. However, with the setting of the elastic component 6, after the die is opened, the protrusion 4 will move upward under the action of elastic force and separate from the stamping groove, thereby preventing interference with the subsequent conveying of the strip 3. This design can also reduce the complexity of the feeding module in the stamping die, that is, the strip 3 can reduce one lifting action.

[0038] Specifically, such as Figure 7 As shown, the elastic component 6 includes a first top block 601 and a second top block 602. Both the first top block 601 and the second top block 602 are vertically slidably installed in the lower mold base 2 and connected to the lower mold base 2 through a nitrogen spring 603. The first top block 601 is located in the stamping groove and cooperates with the protrusion 4, while the second top block 602 cooperates with the strip 3.

[0039] Understandably, during mold closing, the nitrogen spring 603 is in a compressed, energy-storing state. After mold opening, the nitrogen spring 603 acts on the two ejector blocks to move upwards. At this time, ejector block one 601 pushes the protrusion 4 upwards and separates it from the stamping groove, while ejector block two 602 pushes the strip 3 slightly upwards, ensuring that there is no excessive friction between the strip 3 and the lower die holder 2, thus facilitating the feeding module's transport. Of course, the feeding module is common knowledge known to those skilled in the art. This design not only improves stamping efficiency but also ensures the stability of the stamping process.

[0040] In one embodiment of this application, a flattening block (not shown) corresponding to the protrusion 4 can be provided in the lower mold base 2. It is understood that the abutting cooperation between the protrusion 4 and the pitch stop 5 achieves the fixed-distance conveying of the material strip 3; however, this cooperation can also interfere with the conveying of the material strip 3. Therefore, when the upper mold base 1 and lower mold base 2 close again, the protrusion 4, which cooperates with the pitch stop 5, will be compressed to be flush with the material strip 3 under the action of the flattening block, thus preventing interference with the subsequent conveying of the material strip 3.

[0041] Specifically, in this application, the stamping die in this design mainly performs stamping, cutting, and tapping processes on the product. Specifically, a tapping device (not shown) is installed on the upper die holder 1, and a positioning rod 8 (e.g., ...) is provided inside the lower die holder 2. Figure 7(As shown). It can be understood that during the stamping process, after the upper die holder 1 and lower die holder 2 are closed, the tapping device can tap the product area 301 of the strip 3 to create a threaded hole 7. This threaded hole 7 also serves as a limiting device for the strip 3. Specifically, after the strip 3 is conveyed, the threaded hole 7 also moves and is conveyed. When the protrusion 4 abuts against the pitch stop 5, the threaded hole 7 aligns with the positioning rod 8. Subsequently, after the die is closed, the insertion and engagement of the threaded hole 7 and the positioning rod 8 further limits the movement of the strip 3.

[0042] Furthermore, to improve the smoothness of the insertion and positioning between the threaded hole 7 and the positioning rod 8, the top of the positioning rod 8 preferably adopts a tapered structure. This creates a clearance fit between the top of the positioning rod 8 and the threaded hole 7, allowing the positioning rod 8 to be inserted into the threaded hole 7 more easily, reducing resistance during the fit and improving positioning efficiency and accuracy. In addition, the tapered positioning rod 8 can also correct the position of the material strip 3 to a certain extent. That is, when the threaded hole 7 and the positioning rod 8 are aligned, their axial positions may deviate. However, when the positioning rod 8 is inserted into the threaded hole 7, the guiding action of the positioning rod 8 allows their axial positions to coincide, thus enabling the material strip 3 to be conveyed more accurately within a pitch.

[0043] The pitch positioning method of this utility model includes the following steps:

[0044] S100: The upper die holder 1 and the lower die holder 2 close for the first time, that is, the stamping head engages with the stamping groove, and then stamps out a protrusion 4 (designated as protrusion one) integrally formed with the strip 3 in the scrap area 302 of the strip 3. At the same time, the tapping device also taps the corresponding threaded hole 7 in the product area 301 of the strip 3. Figure 5 Process I in the process.

[0045] S200: The upper die holder 1 moves upward and the lower die holder 2 separates from the die. At this time, the first protrusion will separate from the stamping groove under the elastic force of the first ejector block 601 and the nitrogen spring 603. Similarly, the strip 3 will be lifted to a certain height under the elastic force of the second ejector block 602 and the nitrogen spring 603, and then conveyed forward under the action of the feeding module. Simultaneously, the first protrusion will move with the strip 3 until it abuts against the pitch stop bar 5, thereby achieving pitch positioning of the strip 3. Figure 5 Process II in the middle.

[0046] S300: At this point, the upper die holder 1 and the lower die holder 2 close the mold again, meaning the stamping head and the stamping groove engage again, and a protrusion 4 (designated as protrusion two) integrally formed with the strip 3 is stamped out in the next scrap area 302 of the strip 3. Simultaneously, the tapping device also taps the corresponding threaded hole 7 in the next product area 301 of the strip 3. Meanwhile, the original protrusion one is compressed and flattened to be flush with the strip 3 by the flattening block. This is to prevent protrusion one from being locked by the pitch stop 5 after the mold reopens, thus facilitating the subsequent movement of the strip 3. Figure 5 Process III in the middle.

[0047] S400: At this time, the upper mold base 1 and the lower mold base 2 separate from the mold again. Similarly, the material strip 3 will move forward by one pitch, and then the second convex bulge will engage with the pitch stop 5 to achieve pitch positioning.

[0048] S500: Repeat steps S300 and S400 above until the stamping process of the entire strip 3 is completed.

[0049] It should be understood that subsequent convex bulges three, four, five, etc., will repeat the above steps, namely, stamping, pitch positioning, and subsequent flattening and back-pressing processes; of course, in the subsequent S300, after the upper die holder 1 and the lower die holder 2 are closed, the waste area 302 corresponding to the flattened convex bulge 4 will be stamped off (i.e., Figure 5 (Process III in the middle).

[0050] It should be noted that the stamping die of this application is mainly designed for in-die tapping products. By stamping a protrusion 4 in the scrap area 302, subsequent pitch positioning is achieved. Furthermore, the tapping position is precisely achieved through the subsequent positioning rod 8. Previously, at least ten taps would break during a batch production, and there was a risk of production stalling and even stepping errors. Now, with this stamping die design, tap breakage during production is greatly reduced, almost eliminating it altogether. Simultaneously, production efficiency and stability are significantly improved. This die not only simplifies the production process and reduces production costs but also improves product quality and consistency. In addition, the die design fully considers ease of operation and maintenance, allowing operators to easily learn and reduce training costs and time. In summary, this stamping die and its pitch positioning method represent a highly efficient, stable, and reliable production solution, bringing a creative change to the production of in-die tapping products.

[0051] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A pitch positioning device for a stamping die, characterized in that, include: Upper die holder, wherein a stamping head is provided at the bottom end of the upper die holder; The lower die base has a stamping groove at its top end that mates with the stamping head; as well as A pitch stop bar is provided on the lower die base. During the stamping operation, the upper die base cooperates with the lower die base, thereby causing the scrap area of ​​the strip to be stamped out into a convex shape integrally formed with the strip under the action of the stamping head and the stamping groove. The convex shape has a rectangular structure, and the side of the convex shape abuts against the side of the pitch stop bar to achieve pitch positioning of the strip.

2. The pitch positioning device for stamping dies as described in claim 1, characterized in that: The adjacent sides of the convex hull are provided with a chamfered structure.

3. The pitch positioning device for stamping dies as described in claim 2, characterized in that: The thickness of the strip is H, and the thickness of the convex bulge is h, where 0.5H≦h≦0.7H.

4. The pitch positioning device for stamping dies as described in any one of claims 1-3, characterized in that: The lower die holder is provided with an elastic component; when the upper die holder separates from the lower die holder, the protrusion is adapted to move upward under the action of elastic force and separate from the stamping groove.

5. The pitch positioning device for stamping dies as described in claim 4, characterized in that: The elastic component includes a top block one and a top block two. Both top block one and top block two are vertically slidably installed in the lower die base and connected to the lower die base through a nitrogen spring. Top block one is located in the stamping groove and cooperates with the protrusion, while top block two cooperates with the strip.

6. The pitch positioning device for stamping dies as described in claim 4, characterized in that: The lower mold base is provided with a flattening block; when the upper mold base and the lower mold base are closed again, the protrusion is adapted to be compressed to be flush with the material strip under the action of the flattening block.

7. The pitch positioning device for stamping dies as described in claim 6, characterized in that: The upper die holder is provided with a tapping device, and the lower die holder is provided with a positioning rod. During the stamping operation, the tapping device is adapted to tap the product area of ​​the strip to generate a threaded hole, and the positioning rod is adapted to cooperate with the threaded hole to limit the strip.

8. The pitch positioning device for stamping dies as described in claim 7, characterized in that: The top of the positioning rod has a tapered structure, which allows the top of the positioning rod to have a clearance fit with the threaded hole.

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